# Thread: Whole number and fraction multiplied by whole number and fraction

1. ## Whole number and fraction multiplied by whole number and fraction

-1 and 3 over 4 multiplied by -1 and 2 over 5, I got 1 and 6 over 20 and my calculator says 1 and 9 over 20, how did it get that answer? I am confused

2. Is this the problem?

$-1\frac{3}{4}\times -1\frac{2}{5}$

$-\frac{7}{4}\times -\frac{7}{5}$

$\frac{7\times 7}{4 \times 5} = \frac{49}{20} = 2\frac{9}{20}$

3. ## How do I do it?

How do I do the problem itself? I have other problems like it

4. The easiest thing to do to solve these kind of problems is to turn it into one fraction, so you don't have a mixed fraction.

$-1\frac{3}{4} = \frac{-7}{4}$

Once you have done that, just multiply the numerator by the numerator and the denominator by the denominator.

$\frac{a}{b} \times \frac{c}{d} = \frac{a \times c}{b \times d}$